\begin{tabular*}{\textwidth}{l @{\extracolsep{\fill}} cccccc}
\toprule
\multirow{2}{*}{Outcome}                            & \multicolumn{6}{c}{Subsample}                                                                                                                                                                                                                                                 \\
\cmidrule(lr){2-7}
& Lame duck                                     & Oil Windfall                          & \multicolumn{2}{c}{Tiebout competition}       & \multicolumn{2}{c}{Ideology distance}                 \\
&                                               &                                                       &  $<$ median    &  $<$ 25th pct           & $>$ median                 &  $> $ 75th pct                 \\
\midrule
Social expenditures                                         &      0.91                    &            1.74                   &            0.41          &     -0.42         &      0.56             &      0.38              \\
share                                                               & (     0.48)                 &               (     1.01)        & (     0.42)             & (     0.47)      & (     0.50)  & (     0.59)   \\
\midrule
Social expenditures                                         &      3.09                               &      5.74                            &     -1.40                   &     -2.24            &      0.75                &     -1.02                 \\
per capita                                                  & (     1.72)                    & (     2.74)                         & (     1.39)                & (     1.57)         & (     1.52)             & (     1.75)              \\
\bottomrule
\end{tabular*}
